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Letters Patent No. 79,(l46, dated June' .16, 1858,

IMPROVEMENT sass-rasanten.

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TO ALL WHOM IT MAY CONGERN:

Beit known that LFBA'NVCIS ZELL, of the city of' Louisville, and in the county of'tleierson, and State of Kentucky, have Ainvented af'new and useful improvement-in Window-Sash Locks; and I do hereby declare 'the following to be a f ull, clear, and exact descriptionof the same, suiiicient to enable others skilled in the art to which niy invention appertains to fully understand and use' the same, reference being had to the accompanying drawings, .which are made 'part of this specification, and in whichi i `Figure 1 is a section of the upper and lower parts cfa pair of .window-sashes with my invention applied.

i lowered.

Figure 3 is a longitudinal section of the lock or fastening'. Figure 4 is an under side view of the lock or fastening.

Figure 5 is a front elevation of the socket.

Similar letters of reference indicate corresponding parts in lthe several igures.

The object of this invention is to providea self-closing sash-lock, whose bolt shall,l when retracted from its socket, maintain its retractedA position of itself, without requiring` to be so held by hand, thus facilitating the raising or lowering of thesash. p

lu thedrawings, A may represent the upper part of' a lower window-sash, and A the lower part oi' itslnate. B is a'bolt, fitted to slide to 'a limited extent in the ca'se B', which is screwed to one of thesashes.4 The socket C, which receives the bolt B, in order to lock the twoV sashes'together, is screwed or otherwise suitably fastened to the other sash. i

Thenlarged portion of the. bolt B, which enters the socket C, is formed with aA longitudinal groove or recess, which is occupied by a spring, D, which is made fast at one .end to the bolt B.

When the bolt B is retracted to the position shown in tig. 2, the projection (Z of the spring D is caused by the resilience ofthe latter tohenter the aperture b 'in the case B, and the holt is thus retained'in .its retracted position, affording ample tiine to raise or lower lthe sash without-the necessity of maintaining the retracted posi- .tion of the bolt by hand. The projection cZ has slight longitudinal play in the aperture b, so that when the projection d on the end of the spring D is relieved from contact with the socket-plate c by the slight upward 'or downward movement of one of thesashes, the bolt, together with the spring D, is projected a little way beyond -the end of the case B, as shown in iig. 2.V When thesasles are brought tothe closed position in which they v are shown in iig. 1, the-,projection d, on the forwardextrernity of the spring D, cornes in contact with the projccting part c of the socketplateand the spring D being thereby raised sufficiently to withdraw the projection d from the aperture b, the boltB is throwuinto the socket C by the action oi' the spring E, which encircles the smaller part of thelbolt B, and is enclosed within thecasc B.

vFrom the above it is obvious that my sash-lock possesses important features', nainely, the bolt, when once retracted, will not again'spring Vinto the socket until one ot. the sashes hasbeen raised and lowered, or 'vz'ce versa, sufficiently to actuate the spring D, `and secondly, the bolt will invariably spring into the socket when the sash is closed. y i

The bolt B may be retracted by vmeans of a common stud projecting through a longitudinal slot in the case, out Iprefer to use a pivoted handle, F, as shown in the drawings. 'When the sashes are closed, and the bolt is in the socket, the gravitating lmovement of the handle F' cascs the projection or ngerj'to take into the aperture b of the case B. This contrivance prevents the bolt B fromV being pushed ont of the socket C from the outside.

c c are inelines or sloping shoulders at the opposite sides of the entrance to the socket. If'the Vsashesare out of line, or loosely litt-ed` 'in the window-frame, thes'e inclines will guide the projecting end of the bolt B to the mouth or entrance of the socket, so that when the spring D. is raised, the bolt will invariably-enter the socket.

Figure 2 is a similar View, showing the position of the parts when the lower sash is raised or the upper sash I do not propose to limit the application of 4this lock or fastening to window-seshes, or to any, other spev cial use. It may be npalied to doors,- shutters, and drawers, and, in fact, wherever a spring-bolt is desirable.

I also propose to pply the' additional spring D, either externallyorinternally, and in any manner that will secure the result hereinbefore mintaind. A

Having thus 'described my invention, what I claim :is new, anddesire to secure by Letters Patent, is- 3 l. .The spring'D, so a-ttatehedto the springbolt B, that when tbe latter is retracted it shall be retained in' its retracted position, but be partially-projected from its casing by the movement of the sashs0 as to be brought against a. projection, released, and thrown into the socket when the .sash is closed, substantially as and for the purpose set forth.

2. The pivoted hndle F,'ip'rovided with a. projection or iinger,f, for locking the bolt, und operating in the mdnner and'for the purpose explaineci.

To the above, I have signed my name, this 1st day of May,.1868.

' FRANCIS ZELL. Witnesses:

Joni: A. WIEDEnsnmM, 

